Fifty-three callers to the campus radio station were asked what they usually listened to while driving to school. Of those asked, 22 listened to a local radio station, 18 listened to satellite radio, 33 listened to MP3 players, 8 listened to a local radio station and satellite radio, 13 listened to satellite radio and MP3 players, 11 listened to a local radio station and an MP3 player, and 6 listened to all three.
(a) How many listened to only satellite radio?
(b) How many listened to local radio stations and MP3 players but not satellite radio?
(c) How many listened to none of these?
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